MX641DW Просмотр технического описания (PDF) - MX-COM Inc

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MX641DW

Dual SPM Detector

MX-COM Inc  

Dual SPM Detector

SIGNAL INPUT

TONE

8

NOTONE

CH1 and CH 2 OUTPUTS

TONE FOLLOWER OUTPUT

PACKET MODE OUTPUT

SIGNAL INPUT ......

RESPONSE

DELAY

MX641 PRELIMINARY INFORMATION

TONE FOLLOWER OUTPUT ......

PACKET MODE OUTPUT ......

DERESPONSE

DELAY

Figure 4: Tone Follower and Packet Mode Outputs

4.3 Sensitivity Setting

To enable the MX641 to operate correctly to most national 12kHz and 16kHz SPM specifications, the input sensitivity can

be accurately adjusted and set.

There are two different pin-selectable modes of sensitivity setting available to the MX641: Controlled Sensitivity Mode and

Fixed Sensitivity Mode

The Controlled Sensitivity mode allows the sensitivity setting from a µController via a 6-bit serial data input. This same

serial input also sets operation (bit 0) to either 12kHz or 16kHz systems. Both channels are set identically.

The Fixed Sensitivity mode allows the sensitivity of each channel to be set to a fixed “gain” by external components at the

input amplifiers. Operation to either 12kHz or 16kHz is by the System Select input.

4.3.1 Controlled Sensitivity Setting

With the external gain (sensitivity) components used as shown in Figure 2, the gain of the input stages is 19.8dB (12kHz)

or 20.5dB (16kHz). For controlled sensitivity setting the gain of each bandpass filter, and therefore the device sensitivity,

is adjusted by the applied serial bits D1 to D5.

In the Controlled Sensitivity mode the system frequency is selected by bit D0 (‘1’ = 12kHz; ‘0’ = 16kHz). Data is loaded

Bit 5 (D5) first. Table 4 details the serial data inputs for the required sensitivity. Minimum, Nominal and Maximum

Sensitivity figures are provided to make complete allowance for internal circuit offsets and component tolerances.

0dB(ref.) = 775mVRMS at VDD = 5.0 volts; varies directly with VDD.

Note: Device sensitivity is directly proportional to VDD

© 1998 MXxCOM Inc.

www.mxcom.com Tele: 800 638-5577 910 744-5050 Fax: 910 744-5054

Doc. # 20480115.003

4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA

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